Duplicate sales invoices

Please implement a feature similar to “Duplicate Inventory Item Code notification” in all modules.

For eg. We maintain manual sales invoice books with each sales representative. Each day we collect issued invoices and enter them in Manager. But sometimes we end up entering same invoice twice. If Manager would give user a notification for duplicate invoice number then that would be great.

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Actually I’m not satisfied with how deduplication is implemented under inventory items. Some improvements are needed. Then the same concept will be rolled out to all other tabs where it makes sense.